In the "Introduction to DJI Intelligent Flight Battery Auto-Discharging Rules", we learned that battery self-discharge appears when the battery is let idle for storage. When a battery automatically discharges to a sufficiently low battery level (in general: 10%), recharging is required to restore the battery to maintain its energy storage capability. When the battery continues discharging at a  battery level lower than 10%, it is over-discharging, which may cause damage to the electrodes and active materials, and thereby these materials may fail to respond properly.  Long-term over-discharge can cause permanent damage to the battery cell. In serious cases, the battery may be damaged to the extent that it cannot be used.

How to Avoid "Over-Discharge"

When the battery is stored while powered off, it will still consume power at a very low rate, this is a characteristic of lithium batteries. If the battery is stored for an extended period when its charge is already very low, over-discharge may occur.

 

To maintain battery activity and extend its lifetime, if you will not use the battery for more than 10 days, it is recommended to charge the battery to 40–65% and store it in a cool, dry place (ideally 22–28°C). Perform a full charge and discharge cycle at least once every 3 months*: fully charge the battery, insert it in the aircraft, power it on, and discharge it to 65% before storing it again.

 

* A full charge and discharge cycle means fully charging the aircraft battery, then inserting it in the aircraft and powering it on (no need to take off). When the last bar of the power indicator starts flashing, recharge the battery to full. Then, insert it in the aircraft again, power it on, and discharge it to 65% before storing.

How to maintain the battery

1. If the battery will not be used for more than 10 days, please discharge the battery to 40% to 65% (that is, when the third indicator light is on or flashing) before storage.

2. Charge and discharge the battery approximately every 3 months to maintain battery activity, which can extend the battery’s lifetime. If the battery is stored after completely drained, it may over-discharge and be damaged.

3. Always store Intelligent Flight Batteries in a well-ventilated and dry place.

4. The battery will enter hibernation mode if depleted and stored for an extended period of time. Recharge the battery to bring it out of hibernation.

5. When your flight finishes, charge the battery after it has fully cooled down. Charging it while hot may cause damage.

FAQ

1. How can I check information such as battery voltage and cycle count?

DJI Fly

Click "…" in the upper right corner [Safety > Battery Info]

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DJI GO4

Click ["Enter Device" > " …" in the upper right corner > Battery icon]

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2. Why does the battery become swollen?

There are generally two situations for battery swollen. One is after a flight, the battery swells due to heat. If it returns to normal after being left to cool, it can be used as usual. If it does not return to normal after cooling, please contact DJI Support.

If swollen occurs during storage, it may be due to excessive charge cycles causing the battery cell to swell. Another possibility is improper maintenance during long-term storage; since the battery contains chemicals, over-discharge, impact, or water ingress can all cause the battery cell to swell. Whether the battery swollen occurs within or out of the warranty period, it is recommended to contact DJI Support for assistance. 

3. Why does the app display a battery error?

A battery error prompt is usually caused by abnormal communication between the battery and the flight controller, resulting in identification failure. If you have another battery, you can replace it to check whether the issue is with the battery or the aircraft itself. If it is a problem with the aircraft, please send it back for repair. If it is a battery issue and your battery is out of warranty, please purchase a new battery.